WO2019085913A1 - 基于ofdm系统的数据处理方法及智能终端 - Google Patents

基于ofdm系统的数据处理方法及智能终端 Download PDF

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Publication number
WO2019085913A1
WO2019085913A1 PCT/CN2018/112802 CN2018112802W WO2019085913A1 WO 2019085913 A1 WO2019085913 A1 WO 2019085913A1 CN 2018112802 W CN2018112802 W CN 2018112802W WO 2019085913 A1 WO2019085913 A1 WO 2019085913A1
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Prior art keywords
frequency domain
reference signal
signal
data
time domain
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PCT/CN2018/112802
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English (en)
French (fr)
Inventor
唐彦波
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捷开通讯(深圳)有限公司
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Priority to US16/760,456 priority Critical patent/US11405255B2/en
Publication of WO2019085913A1 publication Critical patent/WO2019085913A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H04J13/0062—Zadoff-Chu
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26134—Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H04L27/2663—Coarse synchronisation, e.g. by correlation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2671—Time domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2672—Frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26136—Pilot sequence conveying additional information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a data processing method and an intelligent terminal based on an OFDM system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the bandwidth that a channel can provide is typically much wider than the bandwidth required to transmit one signal. If a channel transmits only one signal, it is very wasteful. In order to make full use of the bandwidth of the channel, an OFDM frequency division multiplexing method can be adopted.
  • the OFDM system has high synchronization requirements, and the transmitted data cannot be reliably recovered without an accurate synchronous receiver.
  • serial PN sequences are used in many synchronization methods to achieve better system performance.
  • the specific solution is: based on the OFDM system, the PN sequence and the OFDM symbol are synchronously transmitted.
  • the pilot frame structure includes an acquisition phase and a synchronization tracking phase, in which only the PN sequence is transmitted; in the synchronization tracking phase, the PN sequence is superimposed on the OFDM symbol sequence for transmission. The position of the start of the OFDM symbol is confirmed by this method to achieve synchronization of the OFDM system.
  • the embodiment of the invention provides a data processing method and an intelligent terminal based on an OFDM system, which can improve the synchronization progress and improve the user experience.
  • the first technical solution adopted by the present invention is to provide a data processing method based on an OFDM system, where the data processing method includes: the communication base station inserts a frequency domain at a medium interval in the frequency domain data. a reference signal; after the frequency domain data inserted into the frequency domain reference signal is equivalently transformed, a frequency domain signal superimposed with the frequency domain reference signal and the frequency domain data is obtained; and the frequency domain signal is used Performing an IFFT transform to obtain a time domain signal that superimposes the time domain reference signal and the time domain data; and transmitting the time domain signal to the smart terminal.
  • the frequency domain reference signal is a Zadoff-Chu sequence.
  • the step of obtaining the frequency domain signal with the frequency domain reference signal and the frequency domain data superimposed by the frequency domain data after the frequency domain reference signal is inserted into the frequency domain reference signal includes:
  • the frequency domain reference signal transmitted by the first subcarrier is replaced by data 0;
  • a frequency domain signal in which the frequency domain reference signal and the frequency domain data are superimposed is obtained.
  • the step of the communication base station inserting the frequency domain reference signal at medium intervals in the frequency domain data specifically includes:
  • the communication base station inserts the frequency domain reference signal at equal intervals in a specific pilot interval in the OFDM symbols of the frequency domain data.
  • the pilot interval is 8.
  • the second technical solution adopted by the present invention is to provide a data processing method based on an OFDM system, where the data processing method includes: receiving, by an intelligent terminal, a superimposed time domain reference signal and time a time domain signal of the domain data; performing FFT transformation on the received time domain signal, converting into a frequency domain signal superimposed with the frequency domain reference signal and the frequency domain data; performing equivalent transformation on the frequency domain signal to obtain an insertion Having the frequency domain data of the frequency domain reference signal; separating the frequency domain reference signal from the frequency domain data to obtain the frequency domain data.
  • the FFT transforms the received time domain signal into a superposed frequency domain reference signal and a frequency domain.
  • the steps of the frequency domain signal of the data also include:
  • the smart terminal matches the time domain reference signal with a preset reference signal to determine a synchronization timing function
  • the location of the frequency domain reference signal is determined based on a synchronization timing function.
  • the step of the smart terminal matching the time domain reference signal and the preset reference signal, and determining the synchronization timing function specifically includes:
  • the smart terminal matches the time domain signal with the preset reference signal by a maximum likelihood algorithm to determine a synchronization timing function.
  • the preset reference signal is a Zadoff-Chu sequence.
  • the reference signal is a sequence of a frequency domain reference signal inserted by the communication base station at equal intervals in the frequency domain data into a time domain signal.
  • the step of performing the FFT transformation on the received time domain signal and converting the frequency domain signal into the frequency domain reference signal and the frequency domain data specifically includes:
  • the intelligent terminal distinguishes the time domain synchronization point by the synchronization timing function, performs FFT transformation on the received time domain signal according to the time domain synchronization point, and converts into a frequency domain signal superimposed with the frequency domain reference signal and the frequency domain data.
  • the step of performing the equivalent conversion on the frequency domain signal to obtain the frequency domain data in which the frequency domain reference signal is inserted specifically includes:
  • the FFT-transformed frequency domain signal includes subcarrier information, the subcarrier is used for data signal transmission, and the intelligent terminal obtains frequency domain data inserted with the frequency domain reference signal by demodulating the data signal transmitted from the subcarrier.
  • a third technical solution adopted by the present invention is to provide an intelligent terminal, where the smart terminal includes a communication circuit, a memory, and a processor, and the processor and the communication circuit respectively Coupling with the memory; the communication circuit is for communicating with a base station, acquiring and transmitting data; the memory is for storing a computer program executed by the processor and intermediate data generated when the computer program is executed When the processor executes the computer program, the following steps are implemented:
  • the intelligent terminal receives a time domain signal that superimposes the time domain reference signal and the time domain data;
  • the FFT transforms the received time domain signal into a superposed frequency domain reference signal and a frequency domain.
  • the steps of the frequency domain signal of the data also include:
  • the smart terminal matches the time domain reference signal with a preset reference signal to determine a synchronization timing function
  • the location of the frequency domain reference signal is determined based on a synchronization timing function.
  • the step of the smart terminal matching the time domain reference signal and the preset reference signal, and determining the synchronization timing function specifically includes:
  • the smart terminal matches the time domain signal with the preset reference signal by a maximum likelihood algorithm to determine a synchronization timing function.
  • the preset reference signal is a Zadoff-Chu sequence.
  • the reference signal is a sequence of a frequency domain reference signal inserted by the communication base station at equal intervals in the frequency domain data into a time domain signal.
  • the step of performing the FFT transformation on the received time domain signal and converting the frequency domain signal into the frequency domain reference signal and the frequency domain data specifically includes:
  • the intelligent terminal distinguishes the time domain synchronization point by the synchronization timing function, performs FFT transformation on the received time domain signal according to the time domain synchronization point, and converts into a frequency domain signal superimposed with the frequency domain reference signal and the frequency domain data.
  • the step of performing the equivalent conversion on the frequency domain signal to obtain the frequency domain data in which the frequency domain reference signal is inserted specifically includes:
  • the FFT-transformed frequency domain signal includes subcarrier information, the subcarrier is used for data signal transmission, and the intelligent terminal obtains frequency domain data inserted with the frequency domain reference signal by demodulating the data signal transmitted from the subcarrier.
  • the communication base station of the present invention inserts a frequency domain reference signal at intervals in the frequency domain data, performs equivalent conversion and IFFT transformation on the frequency domain data inserted after the frequency domain reference signal, and obtains a time domain of superimposing the time domain reference signal and the time domain data. Signal and send it to the smart terminal.
  • the progress of synchronization can be improved and the user experience can be improved.
  • FIG. 1 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a data processing method based on an OFDM system according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram showing the structure of a processing signal of the data processing method based on the OFDM system of FIG. 2;
  • FIG. 4 is a schematic flowchart of a data processing method based on an OFDM system according to another embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an intelligent terminal according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an intelligent terminal according to an embodiment of the present invention.
  • the present invention provides a data processing method and an intelligent terminal based on an OFDM system.
  • the data transmission system of the present embodiment includes a communication base station 10 and a receiving end 20, and the communication base station 10 performs data transmission with the receiving end 20 via a wireless channel.
  • the receiving end 20 includes a smart terminal, such as a smart phone, a tablet computer, and the like.
  • the bandwidth of the wireless channel is limited, and in the process of data transmission, the bandwidth provided by the wireless channel is usually much wider than the bandwidth required by the data, in order to fully utilize the bandwidth of the channel.
  • the OFDM frequency division multiplexing method transmits data.
  • OFDM systems have higher requirements for synchronization and channel estimation.
  • the present embodiment provides a data processing method based on an OFDM system from the perspective of a communication base station.
  • FIG. 2 is a schematic flowchart diagram of a data processing method based on an OFDM system according to an embodiment of the present invention.
  • the communication base station inserts the frequency domain reference signal at medium intervals in the frequency domain data.
  • the communication base station inserts the frequency domain reference signal at intervals in the frequency domain data. Specifically, the communication base station inserts the frequency domain reference signal at equal intervals according to a specific pilot interval in the OFDM symbols of the frequency domain data.
  • a Zadoff-Chu sequence is employed as the frequency domain reference signal. According to the characteristics of the Fourier transform, sequences inserted at equal intervals in the frequency domain form a periodic signal in the time domain after IFFT, and have good autocorrelation properties.
  • the pilot interval based on the OFDM system is 6, and in the present embodiment, the pilot interval is 8, so in the case of the same number of subcarriers, the number of pilot signals required by the data processing method of the present embodiment is small. That is, the number of frequency domain reference signals is small, and the occupied bandwidth resources are reduced.
  • the communication base station performs equivalent conversion on the frequency domain data after the frequency domain reference signal is inserted, and obtains a frequency domain signal in which the frequency domain reference signal and the frequency domain data are superimposed.
  • the frequency domain data after inserting the frequency domain reference signal is respectively transmitted by using at least the first subcarrier and the second subcarrier; and the frequency domain reference signal transmitted by the first subcarrier is replaced by the data 0, and the frequency domain data is reserved; The frequency domain data of the two subcarrier transmissions is replaced by data 0, and the frequency domain reference signal is reserved. Thereby, a frequency domain signal superimposed with the frequency domain reference signal and the frequency domain data is obtained.
  • the communication base station performs IFFT conversion on the frequency domain signal to obtain a time domain signal in which the time domain reference signal and the time domain data are superimposed.
  • the time domain signal has periodicity and symmetry from the perspective of the entire OFDM symbol, and these characteristics enable the receiving end to have a plurality of expressions for calculating the correlation operation of the synchronization timing function, so that the receiving end can select the corresponding operation mode in different environments. Improve the progress of the synchronization.
  • the reference signals in the time domain after the IFFT transform are periodic.
  • the frequency domain data is converted into time domain data by IFFT transform, and the time domain data is superimposed with the time domain reference signal to form a time domain signal.
  • the reference signal superimposed by this method does not actually add any redundant information, but has a pseudo-overlay effect in the time domain.
  • the energy of the time domain reference signal is 1/8 of the energy of the frequency domain reference signal, and the interference of the reference signal on the data signal is reduced.
  • the communication base station sends the time domain signal that superimposes the time domain reference signal and the time domain data to the smart terminal, so that the smart terminal can assist the accurate synchronization by the autocorrelation and cross-correlation characteristics of the reference signal, thereby improving The progress of the synchronization.
  • FIG. 3 is a schematic diagram showing the structure of the processing signal of the data processing method based on the OFDM system of FIG.
  • the frequency domain reference signals 31 are equally inserted into the OFDM symbols of the frequency domain data 32, and after equivalent conversion, the superposed frequency domain signals of the frequency domain reference signal 31 and the frequency domain data 32 are formed.
  • the frequency domain reference signal 31 in the frequency domain signal transmitted by the first subcarrier is replaced by data 0, and only the frequency domain data 32 is reserved; and the frequency domain data 32 in the frequency domain signal transmitted by the second subcarrier is used for data. 0 is replaced, only the frequency domain reference signal 31 is reserved.
  • the frequency domain signal is then subjected to IFFT conversion to obtain a time domain signal of the time domain reference signal 33 and the time domain data 34.
  • the communication base station of the present embodiment inserts a frequency domain reference signal at intervals in the frequency domain data, performs equivalent conversion and IFFT transform on the frequency domain data inserted after the frequency domain reference signal, and obtains a superimposed time domain reference signal.
  • the time domain signal of the time domain data is sent to the smart terminal.
  • FIG. 4 is a schematic flowchart diagram of a data processing method based on an OFDM system according to another embodiment of the present invention.
  • the present embodiment provides a data processing method based on an OFDM system from the perspective of a receiving end.
  • the receiving end of the embodiment is a smart terminal.
  • the smart terminal receives a time domain signal that superimposes the time domain reference signal and the time domain data.
  • the smart terminal includes a smart phone, a tablet computer and the like.
  • the intelligent terminal receives the time domain signal of the superimposed time domain reference signal and the time domain data transmitted by the communication base station.
  • the reference signal is preset in the smart terminal, and the reference signal is a sequence in which the frequency domain reference signal inserted by the communication base station at equal intervals in the frequency domain data is converted to the time domain signal in the above embodiment. Then, the reference signal has good autocorrelation and cross-correlation characteristics with the time domain signals of the superimposed time domain reference signal and the time domain data received by the intelligent terminal.
  • the preset reference signal is a Zadoff-Chu sequence.
  • the intelligent terminal matches the time domain reference signal with the preset reference signal, determines a synchronization timing function, and determines the location of the frequency domain reference signal according to the synchronization timing function.
  • the pilot is inserted in the first OFDM symbol and the penultimate OFDM symbol of each slot. Because of the periodicity of the reference sequence, to correctly distinguish the time domain synchronization point, the timing function in each cycle is compared, and the computational complexity is high. Therefore, the present embodiment uses the maximum likelihood algorithm to receive the received time domain signal.
  • the preset reference signals are matched to determine the synchronization timing function for simple and accurate timing.
  • the intelligent terminal distinguishes the time domain synchronization point by using a synchronization timing function, performs FFT transformation on the received time domain signal according to the time domain synchronization point, and converts the frequency domain into a frequency domain in which the frequency domain reference signal and the frequency domain data are superimposed. signal.
  • the intelligent terminal performs equivalent conversion on the frequency domain signal to obtain frequency domain data in which the frequency domain reference signal is inserted.
  • the FFT-transformed frequency domain signal includes subcarrier information, and the subcarrier is used for data signal transmission, and the data signal transmitted by the subcarrier needs to be obtained by demodulation.
  • the data signal transmitted by the intelligent terminal from the subcarrier by means of demodulation that is, the frequency domain data in which the frequency domain reference signal is inserted.
  • the intelligent terminal separates the frequency domain signal from the frequency domain data to obtain frequency domain data, where the frequency domain data is data information sent by the communication base station to the intelligent terminal.
  • the data transmission between the communication base station and the intelligent terminal is based on the OFDM system.
  • the communication base station transmits the frequency domain data to the intelligent terminal by converting the time domain signal of the superimposed time domain reference signal and the time domain data, and the intelligent terminal will receive the time domain signal of the superimposed time domain reference signal and the time domain data. Restore to frequency domain data for data transfer.
  • the data transmission method of the invention enables the intelligent terminal to assist in accurate synchronization by the autocorrelation and cross-correlation characteristics of the reference signal, thereby improving the progress of synchronization.
  • the intelligent terminal of the embodiment receives the time domain signal that superimposes the time domain reference signal and the time domain data, and the reference signal is pre-set in the smart terminal, and the reference signal is the communication base station at equal intervals in the frequency domain data.
  • the inserted frequency domain reference signal is transformed into a sequence of time domain signals, and the synchronization timing function is confirmed by the autocorrelation property of the reference signal and the received time domain signal, and the corresponding data processing mode is confirmed according to the synchronization timing function.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Read Only Memory (ROM), Random Access Memory (RAM), disk or optical disk.
  • ROM Read Only Memory
  • RAM Random Access Memory
  • FIG. 5 is a schematic structural diagram of an intelligent terminal according to an embodiment of the present invention.
  • the smart terminal can include a smart phone and an iPad.
  • the smart terminal 50 of the present embodiment includes a communication circuit 501, a processor 502, and a processor 503.
  • the processor 502 is coupled to the communication circuit 501 and the processor 503, respectively.
  • the communication circuit 501 can be used to communicate with, acquire, and transmit information with the communication base station; the processor 502 executing the program data while in operation can implement the OFDM system-based data processing method from the perspective of the receiving end in any of the above embodiments.
  • FIG. 6 is a block diagram showing a specific structure of an intelligent terminal according to an embodiment of the present invention.
  • the smart terminal can be used to implement the OFDM system-based data processing method provided in the foregoing embodiment.
  • the smart terminal 1200 can be a smartphone or a tablet.
  • the smart terminal 1200 may include an RF (Radio Frequency) circuit 110, a memory 120 including one or more (only one shown) computer-readable storage medium, an input unit 130, and a display unit. 140, sensor 150, audio circuit 160, transmission module 170, including processor 180 having one or more processing cores (only one shown) and power supply 190 and the like.
  • RF Radio Frequency
  • FIG. 6 the structure of the smart terminal 1200 shown in FIG. 6 does not constitute a limitation on the smart terminal 1200, and may include more or less components than those illustrated, or combine some components or different components. Arrangement. among them:
  • the RF circuit 110 is configured to receive and transmit electromagnetic waves, and realize mutual conversion between electromagnetic waves and electrical signals, thereby communicating with a communication network or other devices.
  • the RF circuit 110 may include various existing circuit elements for performing these functions, such as an antenna, a radio frequency transceiver, a digital signal processor, an encryption/decryption chip, a Subscriber Identity Module (SIM) card, a memory, and the like.
  • SIM Subscriber Identity Module
  • the RF circuit 110 can communicate with various networks such as the Internet, an intranet, a wireless network, or communicate with other devices over a wireless network.
  • the wireless network described above may include a cellular telephone network, a wireless local area network, or a metropolitan area network.
  • the above wireless networks may use various communication standards, protocols and technologies, including but not limited to global mobile communication systems (Global System for Mobile Communication, GSM), Enhanced Mobile Communication Technology (Enhanced Data GSM Environment, EDGE), Wideband Code Division Multiple Access (Wideband Code) Division Multiple Access, WCDMA), Code Division Multiple Access (Code Division) Access, CDMA), Time Division Multiple Access (TDMA), Wireless Fidelity (Wireless Fidelity, Wi-Fi) (such as the Institute of Electrical and Electronics Engineers Standard IEEE 802.11a, IEEE 802.11b, IEEE 802.11g and / or IEEE 802.11n), VoIP (Voice) Over Internet Protocol, VoIP), Worldwide Interoperability for Microwave Access (Worldwide Interoperability for Microwave Access, Wi-Max, other protocols for mail, instant messaging, and short messages, as well as any other suitable communication protocol, may even include protocols that are not currently being developed.
  • GSM Global System for Mobile Communication
  • EDGE Enhanced Mobile Communication Technology
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple
  • the memory 120 can be used to store software programs and modules, such as the program instructions/modules corresponding to the data processing method based on the OFDM system in the above embodiment, and the processor 180 executes various functions by running software programs and modules stored in the memory 120.
  • Application and data processing that is, the function of implementing data processing based on OFDM systems.
  • Memory 120 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory.
  • memory 120 can further include memory remotely located relative to processor 180, which can be connected to smart terminal 1200 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • the input unit 130 can be configured to receive input numeric or character information and to generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.
  • input unit 130 can include touch-sensitive surface 131 as well as other input devices 132.
  • Touch-sensitive surface 131 also referred to as a touch display or trackpad, can collect touch operations on or near the user (such as a user using a finger, stylus, etc., on any suitable object or accessory on touch-sensitive surface 131 or The operation near the touch-sensitive surface 131) and driving the corresponding connecting device according to a preset program.
  • the touch-sensitive surface 131 can include two portions of a touch detection device and a touch controller.
  • the touch detection device detects the touch orientation of the user, and detects a signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts the touch information into contact coordinates, and sends the touch information.
  • the processor 180 is provided and can receive commands from the processor 180 and execute them.
  • the touch-sensitive surface 131 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves.
  • the input unit 130 can also include other input devices 132.
  • other input devices 132 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, joysticks, and the like.
  • the display unit 140 can be used to display information input by the user or information provided to the user and various graphical user interfaces of the smart terminal 1200, which can be composed of graphics, text, icons, video, and any combination thereof.
  • the display unit 140 may include a display panel 141, and optionally, an LCD (Liquid may be used)
  • the display panel 141 is configured in the form of a Crystal Display (LCD) or an OLED (Organic Light-Emitting Diode).
  • touch-sensitive surface 131 may cover the display panel 141, and when the touch-sensitive surface 131 detects a touch operation thereon or nearby, it is transmitted to the processor 180 to determine the type of the touch event, and then the processor 180 according to the touch event The type provides a corresponding visual output on display panel 141.
  • touch-sensitive surface 131 and display panel 141 are implemented as two separate components to implement input and output functions, in some embodiments, touch-sensitive surface 131 can be integrated with display panel 141 for input. And output function.
  • the smart terminal 1200 can also include at least one type of sensor 150, such as a light sensor, motion sensor, and other sensors.
  • the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 141 according to the brightness of the ambient light, and the proximity sensor may close the display panel 141 when the smart terminal 1200 moves to the ear. And / or backlight.
  • the gravity acceleration sensor can detect the magnitude of acceleration in all directions (usually three axes). When it is stationary, it can detect the magnitude and direction of gravity.
  • the smart terminal 1200 can also be configured with gyroscopes, barometers, hygrometers, thermometers, infrared sensors and other sensors, here No longer.
  • the audio circuit 160, the speaker 161, and the microphone 162 can provide an audio interface between the user and the smart terminal 1200.
  • the audio circuit 160 can transmit the converted electrical data of the received audio data to the speaker 161 for conversion to the sound signal output by the speaker 161; on the other hand, the microphone 162 converts the collected sound signal into an electrical signal by the audio circuit 160. After receiving, it is converted into audio data, and then processed by the audio data output processor 180, transmitted to the, for example, another smart terminal via the RF circuit 110, or outputted to the memory 120 for further processing.
  • the audio circuit 160 may also include an earbud jack to provide communication of the peripheral earphones with the smart terminal 1200.
  • the smart terminal 1200 can help the user to send and receive emails, browse web pages, and access streaming media through the transmission module 170 (for example, a Wi-Fi module), which provides wireless broadband Internet access for users.
  • the transmission module 170 for example, a Wi-Fi module
  • FIG. 6 shows the transmission module 170, it can be understood that it does not belong to the essential configuration of the smart terminal 1200, and may be omitted as needed within the scope of not changing the essence of the invention.
  • the processor 180 is a control center of the smart terminal 1200 that connects various portions of the entire handset with various interfaces and lines, by running or executing software programs and/or modules stored in the memory 120, and recalling data stored in the memory 120.
  • the various functions and processing data of the smart terminal 1200 are executed to perform overall monitoring of the mobile phone.
  • the processor 180 may include one or more processing cores; in some embodiments, the processor 180 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and For applications, etc., the modem processor primarily handles wireless communications. It can be understood that the above modem processor may not be integrated into the processor 180.
  • the intelligent terminal 1200 also includes a power supply 190 (such as a battery) that supplies power to various components.
  • the power supply can be logically coupled to the processor 180 through a power management system to manage charging, discharging, and power consumption through the power management system. Management and other functions.
  • Power supply 190 may also include any one or more of a DC or AC power source, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.
  • the smart terminal 1200 may further include a camera (such as a front camera, a rear camera), a Bluetooth module, and the like, and details are not described herein.
  • the display unit of the smart terminal is a touch screen display
  • the smart terminal further includes a memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be one or one
  • the above processor executes one or more programs that include instructions for performing the following operations:
  • the intelligent terminal receives a time domain signal that superimposes the time domain reference signal and the time domain data;
  • the FFT transforms the received time domain signal into a superposed frequency domain reference signal and a frequency domain.
  • the steps of the frequency domain signal of the data also include:
  • the smart terminal matches the time domain reference signal with a preset reference signal to determine a synchronization timing function
  • the location of the frequency domain reference signal is determined based on a synchronization timing function.
  • the step of the smart terminal matching the time domain reference signal and the preset reference signal, and determining the synchronization timing function specifically includes:
  • the smart terminal matches the time domain signal with the preset reference signal by a maximum likelihood algorithm to determine a synchronization timing function.
  • the preset reference signal is a Zadoff-Chu sequence.
  • the reference signal is a sequence of a frequency domain reference signal inserted by the communication base station at equal intervals in the frequency domain data into a time domain signal.
  • the step of performing the FFT transformation on the received time domain signal and converting the frequency domain signal into the frequency domain reference signal and the frequency domain data specifically includes:
  • the intelligent terminal distinguishes the time domain synchronization point by the synchronization timing function, performs FFT transformation on the received time domain signal according to the time domain synchronization point, and converts into a frequency domain signal superimposed with the frequency domain reference signal and the frequency domain data.
  • the step of performing the equivalent conversion on the frequency domain signal to obtain the frequency domain data in which the frequency domain reference signal is inserted specifically includes:
  • the FFT-transformed frequency domain signal includes subcarrier information, the subcarrier is used for data signal transmission, and the intelligent terminal obtains frequency domain data inserted with the frequency domain reference signal by demodulating the data signal transmitted from the subcarrier.
  • the intelligent terminal of the present embodiment receives the time domain signal that superimposes the time domain reference signal and the time domain data, and the reference signal is pre-set in the smart terminal, and the reference signal is inserted at equal intervals in the frequency domain data by the communication base station.
  • the frequency domain reference signal is transformed into a sequence of time domain signals, and the synchronization timing function is confirmed by the autocorrelation property of the reference signal and the received time domain signal, and the corresponding data processing mode is confirmed according to the synchronization timing function.

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Abstract

本发明公开了一种基于OFDM系统的数据处理方法及智能终端，该数据处理方法包括：通信基站在频域数据中等间隔插入频域参考信号；将插入频域参考信号后的频域数据进行等价变换后，得到叠加有频域参考信号和频域数据的频域信号；对频域信号进行IFFT变换，得到叠加有时域参考信号和时域数据的时域信号；发送时域信号给智能终端。

Description

基于OFDM系统的数据处理方法及智能终端
本申请要求于2017年10月30日提交中国专利局、申请号为201711041949. 6、发明名称为“基于OFDM系统的数据处理方法及智能终端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信领域，特别是涉及一种基于OFDM系统的数据处理方法及智能终端。
 背景技术
OFDM(Orthogonal Frequency Division Multiplexing)即正交频分复用技术，是将信道分成若干正交子信道，将高速数据信号转换成并行的低速子数据流，调制到在每个子信道上进行传输。
在通信系统中，信道所能提供的带宽通常比传送一路信号所需的带宽要宽得多。如果一个信道只传送一路信号是非常浪费的，为了能够充分利用信道的带宽，就可以采用OFDM频分复用的方法。
但是，OFDM系统对同步要求较高，如果没有精确的同步接收端就无法对传送的数据进行可靠的恢复。目前，在众多的同步方法中采用串行PN序列来实现能获得较好的系统性能。
具体的方案为：基于OFDM系统，将PN序列和OFDM符号进行同步传输。导频帧结构中包括捕获阶段和同步跟踪阶段，在捕获阶段只发送PN序列；在同步跟踪阶段，PN序列叠加到OFDM符号序列上进行发送。通过此方法确认OFDM符号开始的位置，以实现OFDM系统的同步。
但是上述方法，同步计算的进度较慢，影响用户体验。
 技术问题
本发明实施例提供一种基于OFDM系统的数据处理方法及智能终端，能够提高同步的进度，提高用户体验。
 技术解决方案
为解决上述技术问题，第一方面，本发明采用的第一个技术方案是：提供一种基于OFDM系统的数据处理方法，所述数据处理方法包括：通信基站在频域数据中等间隔插入频域参考信号；将插入所述频域参考信号后的所述频域数据进行等价变换后，得到叠加有所述频域参考信号和所述频域数据的频域信号；对所述频域信号进行IFFT变换，得到叠加有时域参考信号和时域数据的时域信号；发送所述时域信号给智能终端。
其中，所述频域参考信号为Zadoff-Chu序列。
其中，所述将插入所述频域参考信号后的所述频域数据进行等价变换后，得到叠加有所述频域参考信号和所述频域数据的频域信号的步骤具体包括：
通过至少第一子载波和第二子载波分别传输插入所述频域参考信号后的所述频域数据；
将所述第一子载波传输的所述频域参考信号用数据0替换；
将所述第二子载波传输的所述频域数据用数据0替换，
得到叠加有所述频域参考信号和所述频域数据的频域信号。
其中，所述通信基站在频域数据中等间隔插入频域参考信号的步骤具体包括：
通信基站在频域数据的OFDM符号中按照特定的导频间隔等间隔插入频域参考信号。
其中，所述导频间隔为8。
为解决上述技术问题，第二方面，本发明采用的第二个技术方案是：提供一种基于OFDM系统的数据处理方法，所述数据处理的方法包括：智能终端接收叠加有时域参考信号和时域数据的时域信号；将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号；将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据；将所述频域参考信号与所述频域数据分离，得到所述频域数据。
其中，所述智能终端接收叠加有时域参考信号和时域数据的时域信号的步骤之后，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤之前还包括：
所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数；
根据同步定时函数确定所述频域参考信号的位置。
其中，所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数的步骤具体包括：
所述智能终端通过最大似然算法将所述时域信号与所述预设的参考信号进行匹配，确定同步定时函数。
其中，所述预设的参考信号为Zadoff-Chu序列。
其中，所述参考信号为通信基站在频域数据等间隔插入的频域参考信号变换到时间域信号的序列。
其中，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤，具体包括：
智能终端通过同步定时函数区分时域同步点，根据时域同步点将接收到的时域信号进行FFT变换，转换成叠加有频域参考信号和频域数据的频域信号。
其中，所述将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据的步骤，具体包括：
经过FFT变换的频域信号包含子载波信息，子载波用于数据信号的传输，智能终端通过解调的方式从子载波所传输的数据信号，得到插入有频域参考信号的频域数据。
为解决上述技术问题，第三方面，本发明采用的第三个技术方案是：提供一种智能终端，所述智能终端包括通信电路、存储器及处理器，所述处理器分别与所述通信电路和所述存储器耦合连接；所述通信电路用于与基站进行通信、获取及传输数据；所述存储器用于存储所述处理器执行的计算机程序以及在执行所述计算机程序时所产生的中间数据；所述处理器执行所述计算机程序时，实现如下步骤：
智能终端接收叠加有时域参考信号和时域数据的时域信号；
将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号；
将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据；
将所述频域参考信号与所述频域数据分离，得到所述频域数据。
其中，所述智能终端接收叠加有时域参考信号和时域数据的时域信号的步骤之后，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤之前还包括：
所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数；
根据同步定时函数确定所述频域参考信号的位置。
其中，所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数的步骤具体包括：
所述智能终端通过最大似然算法将所述时域信号与所述预设的参考信号进行匹配，确定同步定时函数。
其中，所述预设的参考信号为Zadoff-Chu序列。
其中，所述参考信号为通信基站在频域数据等间隔插入的频域参考信号变换到时间域信号的序列。
其中，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤，具体包括：
智能终端通过同步定时函数区分时域同步点，根据时域同步点将接收到的时域信号进行FFT变换，转换成叠加有频域参考信号和频域数据的频域信号。
其中，所述将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据的步骤，具体包括：
经过FFT变换的频域信号包含子载波信息，子载波用于数据信号的传输，智能终端通过解调的方式从子载波所传输的数据信号，得到插入有频域参考信号的频域数据。
 有益效果
本发明的通信基站在频域数据中等间隔插入频域参考信号，将插入频域参考信号后的频域数据进行等价变换和IFFT变换后，得到叠加有时域参考信号和时域数据的时域信号，并发送给智能终端。通过该数据处理方法，能够提高同步的进度，提高用户体验。
 附图说明
图1是本发明实施例提供的数据传输系统的结构示意图；
图2是本发明实施例提供的基于OFDM系统的数据处理方法的流程示意图；
图3是图2基于OFDM系统的数据处理方法的处理过程信号结构示意图；
图4是本发明另一实施例提供的基于OFDM系统的数据处理方法的流程示意图；
图5是本发明实施例提供的智能终端的结构示意图。
图6是本发明实施例提供的智能终端的具体结构示意图。
 本发明的实施方式
本发明提供一种基于OFDM系统的数据处理方法及智能终端，为使本发明的目的、技术方案和技术效果更加明确、清楚，以下对本发明进一步详细说明，应当理解此处所描述的具体实施条例仅用于解释本发明，并不用于限定本发明。
参阅图1，本发明实施例提供的数据传输系统的结构示意图。本实施方式的数据传输系统包括通信基站10和接收端20，通信基站10通过无线信道与接收端20进行数据传输。其中，接收端20包括智能终端，如智能手机、平板电脑等。
在通信系统中，无线信道的带宽的资源是有限的，而且在数据传输的过程中，无线信道所提供的带宽通常比数据所需的带宽要宽的多，为了能够充分利用信道的带宽，采用OFDM频分复用的方法传输数据。但是，OFDM系统对同步和信道估计的要求较高。为了提高同步的进度，本实施方式从通信基站的角度提供一种基于OFDM系统的数据处理方法。
参阅图2，图2是本发明实施例提供的基于OFDM系统的数据处理方法的流程示意图。
201：通信基站在频域数据中等间隔插入频域参考信号。
在本实施方式中，通信基站在频域数据中等间隔插入频域参考信号，具体地，通信基站在频域数据的OFDM符号中按照特定的导频间隔等间隔插入频域参考信号。
在一个具体的实施方式中，采用Zadoff-Chu序列作为频域参考信号。根据傅立叶变换的特性，频域上等间隔插入的序列在IFFT后会在时域上形成周期信号，具有良好的自相关特性。
一般基于OFDM系统的导频间隔为6，而在本实施方式中，导频间隔为8，因此在相同子载波数目的情况下，本实施方式的数据处理方法所需要的导频信号数目要少，即频域参考信号的数目要少，占用的带宽资源降低。
202：将插入频域参考信号后的频域数据进行等价变换后，得到叠加有频域参考信号和频域数据的频域信号。
在本实施方式中，通信基站将插入频域参考信号后的频域数据进行等价变换后，得到叠加有频域参考信号和频域数据的频域信号。
具体的，通过至少第一子载波和第二子载波分别传输插入频域参考信号后的频域数据；将第一子载波传输的频域参考信号用数据0替换，保留频域数据；将第二子载波传输的频域数据用数据0替换，保留频域参考信号。从而得到叠加有频域参考信号和频域数据的频域信号。
203：对频域信号进行IFFT变换，得到叠加有时域参考信号和时域数据的时域信号。
在本实施方式中，通信基站对频域信号进行IFFT变换，得到叠加有时域参考信号和时域数据的时域信号。该时域信号从整个OFDM符号上来看具有周期性和对称性，而这些特性使得接收端在计算同步定时函数的相关运算有多种表达方式，方便接收端在不同环境下选择对应的运算方式，提高同步的进度。
具体地，由于频域参考信号是等间隔插入的，经过IFFT变换后在时域上的参考信号是周期性的。频域数据经过IFFT变换后转换为时域数据，该时域数据与时域的参考信号叠加在一起形成时域信号。另外，通过该方式叠加的参考信号，实际上并没有添加任何冗余的信息，只是在时域上有伪叠加的效果。
同时根据傅立叶变换的特性，此时时域参考信号的能量是频域参考信号能量的1/8，则，参考信号对数据信号的干扰降低了。
204：发送时域信号给智能终端。
在本实施方式中，通信基站将叠加有时域参考信号和时域数据的时域信号发送给智能终端，以使智能终端能够通过参考信号的自相关和互相关特性来辅助进行精确同步，从而提高同步的进度。
为了清楚的说明本实施方式数据处理过程中数据信号的变化，参阅图3，图3是图2基于OFDM系统的数据处理方法的处理过程信号结构示意图。
如图3所示，将频域参考信号31等间隔插入到频域数据32的OFDM符号中，经过等价变换后，形成叠加的有频域参考信号31和频域数据32的频域信号。其中，第一子载波所传输的频域信号中的频域参考信号31用数据0替换，只保留频域数据32；而第二子载波所传输的频域信号中的频域数据32用数据0替换，只保留频域参考信号31。然后将频域信号经过IFFT变换后得到时域参考信号33和时域数据34的时域信号。
区别于现有技术，本实施方式的通信基站在频域数据中等间隔插入频域参考信号，将插入频域参考信号后的频域数据进行等价变换和IFFT变换后，得到叠加有时域参考信号和时域数据的时域信号，并发送给智能终端。通过该数据处理方法，能够提高同步的进度，提高用户体验。
参阅图4，图4是本发明另一实施例提供的基于OFDM系统的数据处理方法的流程示意图。结合图1，本实施方式是从接收端的角度提供一种基于OFDM系统的数据处理方法。其中，本实施方式的接收端为智能终端。
401：智能终端接收叠加有时域参考信号和时域数据的时域信号。
其中，智能终端包括智能手机、平板电脑等。
在本实施方式中，智能终端接收通信基站所发送的叠加有时域参考信号和时域数据的时域信号。
同时，智能终端中预设的有参考信号，该参考信号为上述实施方式中通信基站在频域数据等间隔插入的频域参考信号变换到时间域信号的序列。则，该参考信号与智能终端所接收到的叠加有时域参考信号和时域数据的时域信号有良好的自相关和互相关特性。在其中的一个实施方式中，利用Zadoff-Chu序列良好的自相关特性，预设的参考信号为Zadoff-Chu序列。
进一步地，智能终端将时域参考信号与预设的参考信号进行匹配，确定同步定时函数，根据同步定时函数确定频域参考信号的位置。但是，导频是在每个时隙的第一个OFDM符号和倒数第二个OFDM符号中插入。因为参考序列的周期性，要正确的区分时域同步点，则要比较每个周期内的定时函数，计算复杂度较高，因此本实施方式采用最大似然算法将接收到的时域信号与预设的参考信号进行匹配，确定同步定时函数，来简单准确的定时。
402：将接收到的时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号。
在本实施方式中，智能终端通过同步定时函数区分时域同步点，根据该时域同步点将接收到的时域信号进行FFT变换，转换成叠加有频域参考信号和频域数据的频域信号。
403：将频域信号进行等价变换，得到插入有频域参考信号的频域数据。
在本实施方式中，智能终端将频域信号进行等价变换，得到插入有频域参考信号的频域数据。
具体地，经过FFT变换的频域信号包含子载波信息，子载波用于数据信号的传输，需要通过解调的方式获取子载波所传输的数据信号。在本实施方式中，智能终端通过解调的方式从子载波所传输的数据信号，即插入有频域参考信号的频域数据。
404：将频域参考信号与频域数据分离，得到频域数据。
在本实施方式中，智能终端将频域信号与频域数据分离，得到频域数据，其中，频域数据即为通信基站发送给智能终端的数据信息。
上述实施方式中，通信基站和智能终端之间是基于OFDM系统进行数据传输的。具体的说，通信基站通过将频域数据转化为叠加有时域参考信号和时域数据的时域信号发送给智能终端，智能终端将接收到的叠加有时域参考信号和时域数据的时域信号还原为频域数据以实现数据的传输。本发明的数据传输方法，使得智能终端能够通过参考信号的自相关和互相关特性来辅助进行精确同步，从而提高同步的进度。
区别于现有技术，本实施方式的智能终端接收叠加有时域参考信号和时域数据的时域信号，同时智能终端中预设有参考信号，且该参考信号为通信基站在频域数据等间隔插入的频域参考信号变换到时间域信号的序列，利用参考信号与接收到的时域信号的自相关特性确认同步定时函数，并根据该同步定时函数确认相应的数据处理方式。通过该数据处理方法，能够提高同步的进度，提高用户体验。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存储介质中，存储介质可以包括：只读存储器（ROM，Read Only Memory）、随机存取记忆体（RAM，Random Access Memory）、磁盘或光盘等。
参阅图5，图5是本发明实施例提供的智能终端的结构示意图。该智能终端可包括智能手机、iPad一种。
具体如图5所示，本实施方式智能终端50包括：通信电路501、处理器502和处理器503。其中，处理器502分别与通信电路501和处理器503耦合连接。并且，通信电路501可用于与通信基站进行通信、获取及传输信息；处理器502在工作时执行程序数据可实现上述任一实施方式中从接收端的角度的基于OFDM系统的数据处理方法。
关于数据处理方法的具体步骤前述已详尽描述，在此不再赘谈。
图6示出了本发明实施例提供的智能终端的具体结构框图，该智能终端可以用于实施上述实施例中提供的基于OFDM系统的数据处理方法。该智能终端1200可以为智能手机或平板电脑。
如图6所示，智能终端1200可以包括RF（Radio Frequency，射频）电路110、包括有一个或一个以上（图中仅示出一个）计算机可读存储介质的存储器120、输入单元130、显示单元140、传感器150、音频电路160、传输模块170、包括有一个或者一个以上（图中仅示出一个）处理核心的处理器180以及电源190等部件。本领域技术人员可以理解，图6中示出的智能终端1200结构并不构成对智能终端1200的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。其中：
RF电路110用于接收以及发送电磁波，实现电磁波与电信号的相互转换，从而与通讯网络或者其他设备进行通讯。RF电路110可包括各种现有的用于执行这些功能的电路元件，例如，天线、射频收发器、数字信号处理器、加密/解密芯片、用户身份模块（SIM）卡、存储器等等。RF电路110可与各种网络如互联网、企业内部网、无线网络进行通讯或者通过无线网络与其他设备进行通讯。上述的无线网络可包括蜂窝式电话网、无线局域网或者城域网。上述的无线网络可以使用各种通信标准、协议及技术，包括但并不限于全球移动通信系统（Global System for Mobile Communication, GSM）、增强型移动通信技术（Enhanced Data GSM Environment, EDGE)，宽带码分多址技术（Wideband Code Division Multiple Access, WCDMA），码分多址技术（Code Division Access, CDMA）、时分多址技术（Time Division Multiple Access, TDMA），无线保真技术（Wireless Fidelity， Wi-Fi）（如美国电气和电子工程师协会标准 IEEE 802.11a， IEEE 802.11b, IEEE802.11g 和/或 IEEE 802.11n）、网络电话（Voice over Internet Protocol, VoIP）、全球微波互联接入（Worldwide Interoperability for Microwave Access， Wi-Max）、其他用于邮件、即时通讯及短消息的协议，以及任何其他合适的通讯协议，甚至可包括那些当前仍未被开发出来的协议。
存储器120可用于存储软件程序以及模块，如上述实施例中基于OFDM系统的数据处理方法对应的程序指令/模块，处理器180通过运行存储在存储器120内的软件程序以及模块，从而执行各种功能应用以及数据处理，即实现基于OFDM系统的数据处理的功能。存储器120可包括高速随机存储器，还可包括非易失性存储器，如一个或者多个磁性存储装置、闪存、或者其他非易失性固态存储器。在一些实例中，存储器120可进一步包括相对于处理器180远程设置的存储器，这些远程存储器可以通过网络连接至智能终端1200。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
输入单元130可用于接收输入的数字或字符信息，以及产生与用户设置以及功能控制有关的键盘、鼠标、操作杆、光学或者轨迹球信号输入。具体地，输入单元130可包括触敏表面131以及其他输入设备132。触敏表面131，也称为触摸显示屏或者触控板，可收集用户在其上或附近的触摸操作（比如用户使用手指、触笔等任何适合的物体或附件在触敏表面131上或在触敏表面131附近的操作），并根据预先设定的程式驱动相应的连接装置。可选的，触敏表面131可包括触摸检测装置和触摸控制器两个部分。其中，触摸检测装置检测用户的触摸方位，并检测触摸操作带来的信号，将信号传送给触摸控制器；触摸控制器从触摸检测装置上接收触摸信息，并将它转换成触点坐标，再送给处理器180，并能接收处理器180发来的命令并加以执行。此外，可以采用电阻式、电容式、红外线以及表面声波等多种类型实现触敏表面131。除了触敏表面131，输入单元130还可以包括其他输入设备132。具体地，其他输入设备132可以包括但不限于物理键盘、功能键（比如音量控制按键、开关按键等）、轨迹球、鼠标、操作杆等中的一种或多种。
显示单元140可用于显示由用户输入的信息或提供给用户的信息以及智能终端1200的各种图形用户接口，这些图形用户接口可以由图形、文本、图标、视频和其任意组合来构成。显示单元140可包括显示面板141，可选的，可以采用LCD(Liquid Crystal Display，液晶显示器)、OLED(Organic Light-Emitting Diode,有机发光二极管)等形式来配置显示面板141。进一步的，触敏表面131可覆盖显示面板141，当触敏表面131检测到在其上或附近的触摸操作后，传送给处理器180以确定触摸事件的类型，随后处理器180根据触摸事件的类型在显示面板141上提供相应的视觉输出。虽然在图6中，触敏表面131与显示面板141是作为两个独立的部件来实现输入和输出功能，但是在某些实施例中，可以将触敏表面131与显示面板141集成而实现输入和输出功能。
智能终端1200还可包括至少一种传感器150，比如光传感器、运动传感器以及其他传感器。具体地，光传感器可包括环境光传感器及接近传感器，其中，环境光传感器可根据环境光线的明暗来调节显示面板141的亮度，接近传感器可在智能终端1200移动到耳边时，关闭显示面板141和/或背光。作为运动传感器的一种，重力加速度传感器可检测各个方向上（一般为三轴）加速度的大小，静止时可检测出重力的大小及方向，可用于识别手机姿态的应用（比如横竖屏切换、相关游戏、磁力计姿态校准）、振动识别相关功能（比如计步器、敲击）等; 至于智能终端1200还可配置的陀螺仪、气压计、湿度计、温度计、红外线传感器等其他传感器，在此不再赘述。
音频电路160、扬声器161，传声器162可提供用户与智能终端1200之间的音频接口。音频电路160可将接收到的音频数据转换后的电信号，传输到扬声器161，由扬声器161转换为声音信号输出；另一方面，传声器162将收集的声音信号转换为电信号，由音频电路160接收后转换为音频数据，再将音频数据输出处理器180处理后，经RF电路110以发送给比如另一智能终端，或者将音频数据输出至存储器120以便进一步处理。音频电路160还可能包括耳塞插孔，以提供外设耳机与智能终端1200的通信。
智能终端1200通过传输模块170（例如Wi-Fi模块）可以帮助用户收发电子邮件、浏览网页和访问流式媒体等，它为用户提供了无线的宽带互联网访问。虽然图6示出了传输模块170，但是可以理解的是，其并不属于智能终端1200的必须构成，完全可以根据需要在不改变发明的本质的范围内而省略。
处理器180是智能终端1200的控制中心，利用各种接口和线路连接整个手机的各个部分，通过运行或执行存储在存储器120内的软件程序和/或模块，以及调用存储在存储器120内的数据，执行智能终端1200的各种功能和处理数据，从而对手机进行整体监控。可选的，处理器180可包括一个或多个处理核心；在一些实施例中，处理器180可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序等，调制解调处理器主要处理无线通信。可以理解的是，上述调制解调处理器也可以不集成到处理器180中。
智能终端1200还包括给各个部件供电的电源190（比如电池），在一些实施例中，电源可以通过电源管理系统与处理器180逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。电源190还可以包括一个或一个以上的直流或交流电源、再充电系统、电源故障检测电路、电源转换器或者逆变器、电源状态指示器等任意组件。
尽管未示出，智能终端1200还可以包括摄像头（如前置摄像头、后置摄像头）、蓝牙模块等，在此不再赘述。具体在本实施例中，智能终端的显示单元是触摸屏显示器，智能终端还包括有存储器，以及一个或者一个以上的程序，其中一个或者一个以上程序存储于存储器中，且经配置以由一个或者一个以上处理器执行述一个或者一个以上程序包含用于进行以下操作的指令：
智能终端接收叠加有时域参考信号和时域数据的时域信号；
将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号；
将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据；
将所述频域参考信号与所述频域数据分离，得到所述频域数据。
其中，所述智能终端接收叠加有时域参考信号和时域数据的时域信号的步骤之后，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤之前还包括：
所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数；
根据同步定时函数确定所述频域参考信号的位置。
其中，所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数的步骤具体包括：
所述智能终端通过最大似然算法将所述时域信号与所述预设的参考信号进行匹配，确定同步定时函数。
其中，所述预设的参考信号为Zadoff-Chu序列。
其中，所述参考信号为通信基站在频域数据等间隔插入的频域参考信号变换到时间域信号的序列。
其中，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤，具体包括：
智能终端通过同步定时函数区分时域同步点，根据时域同步点将接收到的时域信号进行FFT变换，转换成叠加有频域参考信号和频域数据的频域信号。
其中，所述将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据的步骤，具体包括：
经过FFT变换的频域信号包含子载波信息，子载波用于数据信号的传输，智能终端通过解调的方式从子载波所传输的数据信号，得到插入有频域参考信号的频域数据。
区别于现有技术，本实施方式智能终端接收叠加有时域参考信号和时域数据的时域信号，同时智能终端中预设有参考信号，且该参考信号为通信基站在频域数据等间隔插入的频域参考信号变换到时间域信号的序列，利用参考信号与接收到的时域信号的自相关特性确认同步定时函数，并根据该同步定时函数确认相应的数据处理方式。通过该数据处理方法，能够提高同步的进度，提高用户体验。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利保护范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (19)

  1. 一种基于OFDM系统的数据处理方法，其中，所述数据处理方法包括：
    通信基站在频域数据中等间隔插入频域参考信号；
    将插入所述频域参考信号后的所述频域数据进行等价变换后，得到叠加有所述频域参考信号和所述频域数据的频域信号；
    对所述频域信号进行IFFT变换，得到叠加有时域参考信号和时域数据的时域信号；
    发送所述时域信号给智能终端。
  2. 根据权利要求1所述的基于OFDM系统的数据处理方法，其中，所述频域参考信号为Zadoff-Chu序列。
  3. 根据权利要求1所述的基于OFDM系统的数据处理方法，其中，所述将插入所述频域参考信号后的所述频域数据进行等价变换后，得到叠加有所述频域参考信号和所述频域数据的频域信号的步骤具体包括：
    通过至少第一子载波和第二子载波分别传输插入所述频域参考信号后的所述频域数据；
    将所述第一子载波传输的所述频域参考信号用数据0替换；
    将所述第二子载波传输的所述频域数据用数据0替换，
    得到叠加有所述频域参考信号和所述频域数据的频域信号。
  4. 根据权利要求1所述的基于OFDM系统的数据处理方法，其中，所述通信基站在频域数据中等间隔插入频域参考信号的步骤具体包括：
    通信基站在频域数据的OFDM符号中按照特定的导频间隔等间隔插入频域参考信号。
  5. 根据权利要求4所述的基于OFDM系统的数据处理方法，其中，所述导频间隔为8。
  6. 一种基于OFDM系统的数据处理方法，其中，所述数据处理的方法包括：
    智能终端接收叠加有时域参考信号和时域数据的时域信号；
    将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号；
    将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据；
    将所述频域参考信号与所述频域数据分离，得到所述频域数据。
  7. 根据权利要求6所述的基于OFDM系统的数据处理方法，其中，所述智能终端接收叠加有时域参考信号和时域数据的时域信号的步骤之后，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤之前还包括：
    所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数；
    根据同步定时函数确定所述频域参考信号的位置。
  8. 根据权利要求7所述的基于OFDM系统的数据处理方法，其中，所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数的步骤具体包括：
    所述智能终端通过最大似然算法将所述时域信号与所述预设的参考信号进行匹配，确定同步定时函数。
  9. 根据权利要求7所述的基于OFDM系统的数据处理方法，其中，所述预设的参考信号为Zadoff-Chu序列。
  10. 根据权利要求7所述的基于OFDM系统的数据处理方法，其中，所述参考信号为通信基站在频域数据等间隔插入的频域参考信号变换到时间域信号的序列。
  11. 根据权利要求7所述的基于OFDM系统的数据处理方法，其中，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤，具体包括：
    智能终端通过同步定时函数区分时域同步点，根据时域同步点将接收到的时域信号进行FFT变换，转换成叠加有频域参考信号和频域数据的频域信号。
  12. 根据权利要求6所述的基于OFDM系统的数据处理方法，其中，所述将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据的步骤，具体包括：
    经过FFT变换的频域信号包含子载波信息，子载波用于数据信号的传输，智能终端通过解调的方式从子载波所传输的数据信号，得到插入有频域参考信号的频域数据。
  13. 一种智能终端，其中，所述智能终端包括通信电路、存储器及处理器，
    所述处理器分别与所述通信电路和所述存储器耦合连接；
    所述通信电路用于与基站进行通信、获取及传输数据；
    所述存储器用于存储所述处理器执行的计算机程序以及在执行所述计算机程序时所产生的中间数据；
    所述处理器执行所述计算机程序时，实现如下步骤：
    智能终端接收叠加有时域参考信号和时域数据的时域信号；
    将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号；
    将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据；
    将所述频域参考信号与所述频域数据分离，得到所述频域数据。
  14. 根据权利要求13所述的智能终端，其中，所述智能终端接收叠加有时域参考信号和时域数据的时域信号的步骤之后，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤之前还包括：
    所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数；
    根据同步定时函数确定所述频域参考信号的位置。
  15. 根据权利要求14所述的智能终端，其中，所述智能终端将所述时域参考信号与预设的参考信号进行匹配，确定同步定时函数的步骤具体包括：
    所述智能终端通过最大似然算法将所述时域信号与所述预设的参考信号进行匹配，确定同步定时函数。
  16. 根据权利要求14所述的智能终端，其中，所述预设的参考信号为Zadoff-Chu序列。
  17. 根据权利要求14所述的智能终端，其中，所述参考信号为通信基站在频域数据等间隔插入的频域参考信号变换到时间域信号的序列。
  18. 根据权利要求14所述的智能终端，其中，所述将接收到的所述时域信号进行FFT变换，转换为叠加有频域参考信号和频域数据的频域信号的步骤，具体包括：
    智能终端通过同步定时函数区分时域同步点，根据时域同步点将接收到的时域信号进行FFT变换，转换成叠加有频域参考信号和频域数据的频域信号。
  19. 根据权利要求13所述的智能终端，其中，所述将所述频域信号进行等价变换，得到插入有所述频域参考信号的所述频域数据的步骤，具体包括：
    经过FFT变换的频域信号包含子载波信息，子载波用于数据信号的传输，智能终端通过解调的方式从子载波所传输的数据信号，得到插入有频域参考信号的频域数据。
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